<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        #box {
            width: 1200px;
            height: 500px;
            margin: 0 auto;
            background-color: antiquewhite;
            overflow: hidden;
        }

        #box>div {
            width: 400px;
            height: 240px;
            background-color: cornflowerblue;
            margin: 100px auto;
            position: relative;
        }
        #box>div>div {
            width: 20px;
            height: 20px;
            background-color: rgba(15, 15, 15, 0.3);
            text-align: center;
            line-height: 20px;
            cursor: pointer;
            position: absolute;
            float: left;
            
            /* color: rgb(0, 0, 0); */
        }
        #bdd1{
            right: 100px;
            bottom: 10px;
            /* display: none; */
        }
        #bdd2{
            bottom: 10px;
            right: 70px;
            /* display: none; */
        }
        #bdd3{
            bottom: 10px;
            right: 40px;
            /* display: none; */
        }
        #bdd4{
            bottom: 10px;
            right:10px;
            /* display: none; */
        }
        #bdd11>img {
            width: 400px;
            height: 240px;
            /* position: absolute; */
            top: 0px;
            left: 0px;
            /* display: none; */
        }
        a{
            text-decoration: none;
            color: rgb(255, 255, 255);
        }
        #box #bdd11{
            width: 400px;
            height: 240px;
            overflow: hidden;
        }
    </style>
</head>

<body>
    <div id="box">
        <div>
            <div id="bdd11">
            <img id="im1" src="./images/img04.jpg">
            <img id="im2" src="./images/img05.jpg">
            <img id="im3" src="./images/img06.jpg">
            <img id="im4" src="./images/img07.jpg"></div>
                <div id="bdd1"><a href="#im1">1</a></div>
                <div id="bdd2"><a href="#im2">2</a></div>
                <div id="bdd3"><a href="#im3">3</a></div>
                <div id="bdd4"><a href="#im4">4</a></div>
        </div>
    </div>
</body>

</html>